Ce Marking; Benchmark; Energy Balance Control; Compressor Hysteresis - Vaillant uniTOWER plus Operating Instructions Manual

Symbol Connection
Domestic hot water circuit, cold
water
Domestic hot water circuit, domestic
hot water
3.7

CE marking

The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the declaration of conformity.
The declaration of conformity can be viewed at the manufac-
turer's site.
3.8

Benchmark

Vaillant is a licensed member of the Benchmark Scheme.
Benchmark places responsibilities on both manufacturers
and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the
manufacturer's instructions by a competent person approved
at the time by the Health and Safety Executive and that it
meets the requirements of the appropriate Building Regu-
lations. The Benchmark Checklist can be used to demon-
strate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commission-
ing and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and
Hotwater Industry Council who manage and promote the
Scheme.
Benchmark is managed and promoted by the Heating and
Hotwater Industry Council.
For more information visit www.centralheating.co.uk
0020291525_04 Installation and maintenance instructions
3.9

Energy balance control

The energy balance is the integral from the difference
between the flow temperature actual value and target value,
which is added up every minute. If the set heat deficit (WE =
-60°min in heating mode) is reached, the heat pump starts.
If the supplied heat volume corresponds to the heat deficit
(integral = 0°min), the heat pump is switched off.
The energy balancing is used for heating and cooling mode.
3.10

Compressor hysteresis

The heat pump is switched on and off via the compressor
hysteresis for heating mode and also for energy balancing.
When the compressor hysteresis is above the target flow
temperature, the heat pump is switched off. When the hys-
teresis is below the target flow temperature, the heat pump
starts up again.
3.11

Cooling mode

Depending on the country, the outdoor unit has the heating
mode or heating and cooling mode function. The indoor unit
is compatible with this.
Outdoor units that are delivered at the factory with no cooling
mode are labelled with "S2" in the nomenclature. For these
units, an optional accessory can be used to subsequently
activate the cooling mode.
It is activated via a coding resistor and via a setting on the
indoor unit's control panel and on the optional system control
(→ Section 8.15).
4

Set-up

4.1

Unpacking the product

1. Remove the product packaging.
2. Remove the documentation.
3. Remove the front casing. (→ Section 4.10.1)
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